src/mount.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <errno.h>
  23 #include <stdio.h>
  24 #include <mntent.h>
  25 #include <sys/epoll.h>
  26 #include <signal.h>
  27
  28 #include "unit.h"
  29 #include "mount.h"
  30 #include "load-fragment.h"
  31 #include "load-dropin.h"
  32 #include "log.h"
  33 #include "strv.h"
  34 #include "mount-setup.h"
  35 #include "unit-name.h"
  36 #include "dbus-mount.h"
  37 #include "special.h"
  38 #include "bus-errors.h"
  39 #include "exit-status.h"
  40 #include "def.h"
  41
  42 static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = {
  43         [MOUNT_DEAD] = UNIT_INACTIVE,
  44         [MOUNT_MOUNTING] = UNIT_ACTIVATING,
  45         [MOUNT_MOUNTING_DONE] = UNIT_ACTIVE,
  46         [MOUNT_MOUNTED] = UNIT_ACTIVE,
  47         [MOUNT_REMOUNTING] = UNIT_RELOADING,
  48         [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING,
  49         [MOUNT_MOUNTING_SIGTERM] = UNIT_DEACTIVATING,
  50         [MOUNT_MOUNTING_SIGKILL] = UNIT_DEACTIVATING,
  51         [MOUNT_REMOUNTING_SIGTERM] = UNIT_RELOADING,
  52         [MOUNT_REMOUNTING_SIGKILL] = UNIT_RELOADING,
  53         [MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING,
  54         [MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING,
  55         [MOUNT_FAILED] = UNIT_FAILED
  56 };
  57
  58 static void mount_init(Unit *u) {
  59         Mount *m = MOUNT(u);
  60
  61         assert(u);
  62         assert(u->meta.load_state == UNIT_STUB);
  63
  64         m->timeout_usec = DEFAULT_TIMEOUT_USEC;
  65         m->directory_mode = 0755;
  66
  67         exec_context_init(&m->exec_context);
  68
  69         /* The stdio/kmsg bridge socket is on /, in order to avoid a
  70          * dep loop, don't use kmsg logging for -.mount */
  71         if (!unit_has_name(u, "-.mount"))
  72                 m->exec_context.std_output = EXEC_OUTPUT_KMSG;
  73
  74         /* We need to make sure that /bin/mount is always called in
  75          * the same process group as us, so that the autofs kernel
  76          * side doesn't send us another mount request while we are
  77          * already trying to comply its last one. */
  78         m->exec_context.same_pgrp = true;
  79
  80         m->timer_watch.type = WATCH_INVALID;
  81
  82         m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
  83
  84         m->meta.ignore_on_isolate = true;
  85 }
  86
  87 static void mount_unwatch_control_pid(Mount *m) {
  88         assert(m);
  89
  90         if (m->control_pid <= 0)
  91                 return;
  92
  93         unit_unwatch_pid(UNIT(m), m->control_pid);
  94         m->control_pid = 0;
  95 }
  96
  97 static void mount_parameters_done(MountParameters *p) {
  98         assert(p);
  99
 100         free(p->what);
 101         free(p->options);
 102         free(p->fstype);
 103
 104         p->what = p->options = p->fstype = NULL;
 105 }
 106
 107 static void mount_done(Unit *u) {
 108         Mount *m = MOUNT(u);
 109         Meta *other;
 110
 111         assert(m);
 112
 113         free(m->where);
 114         m->where = NULL;
 115
 116         /* Try to detach us from the automount unit if there is any */
 117         LIST_FOREACH(units_by_type, other, m->meta.manager->units_by_type[UNIT_AUTOMOUNT]) {
 118                 Automount *a = (Automount*) other;
 119
 120                 if (a->mount == m)
 121                         a->mount = NULL;
 122         }
 123
 124         mount_parameters_done(&m->parameters_etc_fstab);
 125         mount_parameters_done(&m->parameters_proc_self_mountinfo);
 126         mount_parameters_done(&m->parameters_fragment);
 127
 128         exec_context_done(&m->exec_context);
 129         exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
 130         m->control_command = NULL;
 131
 132         mount_unwatch_control_pid(m);
 133
 134         unit_unwatch_timer(u, &m->timer_watch);
 135 }
 136
 137 static MountParameters* get_mount_parameters_configured(Mount *m) {
 138         assert(m);
 139
 140         if (m->from_fragment)
 141                 return &m->parameters_fragment;
 142         else if (m->from_etc_fstab)
 143                 return &m->parameters_etc_fstab;
 144
 145         return NULL;
 146 }
 147
 148 static MountParameters* get_mount_parameters(Mount *m) {
 149         assert(m);
 150
 151         if (m->from_proc_self_mountinfo)
 152                 return &m->parameters_proc_self_mountinfo;
 153
 154         return get_mount_parameters_configured(m);
 155 }
 156
 157 static int mount_add_mount_links(Mount *m) {
 158         Meta *other;
 159         int r;
 160         MountParameters *pm;
 161
 162         assert(m);
 163
 164         pm = get_mount_parameters_configured(m);
 165
 166         /* Adds in links to other mount points that might lie below or
 167          * above us in the hierarchy */
 168
 169         LIST_FOREACH(units_by_type, other, m->meta.manager->units_by_type[UNIT_MOUNT]) {
 170                 Mount *n = (Mount*) other;
 171                 MountParameters *pn;
 172
 173                 if (n == m)
 174                         continue;
 175
 176                 if (n->meta.load_state != UNIT_LOADED)
 177                         continue;
 178
 179                 pn = get_mount_parameters_configured(n);
 180
 181                 if (path_startswith(m->where, n->where)) {
 182
 183                         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0)
 184                                 return r;
 185
 186                         if (pn)
 187                                 if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0)
 188                                         return r;
 189
 190                 } else if (path_startswith(n->where, m->where)) {
 191
 192                         if ((r = unit_add_dependency(UNIT(n), UNIT_AFTER, UNIT(m), true)) < 0)
 193                                 return r;
 194
 195                         if (pm)
 196                                 if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0)
 197                                         return r;
 198
 199                 } else if (pm && path_startswith(pm->what, n->where)) {
 200
 201                         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0)
 202                                 return r;
 203
 204                         if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0)
 205                                 return r;
 206
 207                 } else if (pn && path_startswith(pn->what, m->where)) {
 208
 209                         if ((r = unit_add_dependency(UNIT(n), UNIT_AFTER, UNIT(m), true)) < 0)
 210                                 return r;
 211
 212                         if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0)
 213                                 return r;
 214                 }
 215         }
 216
 217         return 0;
 218 }
 219
 220 static int mount_add_swap_links(Mount *m) {
 221         Meta *other;
 222         int r;
 223
 224         assert(m);
 225
 226         LIST_FOREACH(units_by_type, other, m->meta.manager->units_by_type[UNIT_SWAP])
 227                 if ((r = swap_add_one_mount_link((Swap*) other, m)) < 0)
 228                         return r;
 229
 230         return 0;
 231 }
 232
 233 static int mount_add_path_links(Mount *m) {
 234         Meta *other;
 235         int r;
 236
 237         assert(m);
 238
 239         LIST_FOREACH(units_by_type, other, m->meta.manager->units_by_type[UNIT_PATH])
 240                 if ((r = path_add_one_mount_link((Path*) other, m)) < 0)
 241                         return r;
 242
 243         return 0;
 244 }
 245
 246 static int mount_add_automount_links(Mount *m) {
 247         Meta *other;
 248         int r;
 249
 250         assert(m);
 251
 252         LIST_FOREACH(units_by_type, other, m->meta.manager->units_by_type[UNIT_AUTOMOUNT])
 253                 if ((r = automount_add_one_mount_link((Automount*) other, m)) < 0)
 254                         return r;
 255
 256         return 0;
 257 }
 258
 259 static int mount_add_socket_links(Mount *m) {
 260         Meta *other;
 261         int r;
 262
 263         assert(m);
 264
 265         LIST_FOREACH(units_by_type, other, m->meta.manager->units_by_type[UNIT_SOCKET])
 266                 if ((r = socket_add_one_mount_link((Socket*) other, m)) < 0)
 267                         return r;
 268
 269         return 0;
 270 }
 271
 272 static char* mount_test_option(const char *haystack, const char *needle) {
 273         struct mntent me;
 274
 275         assert(needle);
 276
 277         /* Like glibc's hasmntopt(), but works on a string, not a
 278          * struct mntent */
 279
 280         if (!haystack)
 281                 return false;
 282
 283         zero(me);
 284         me.mnt_opts = (char*) haystack;
 285
 286         return hasmntopt(&me, needle);
 287 }
 288
 289 static bool mount_is_network(MountParameters *p) {
 290         assert(p);
 291
 292         if (mount_test_option(p->options, "_netdev"))
 293                 return true;
 294
 295         if (p->fstype && fstype_is_network(p->fstype))
 296                 return true;
 297
 298         return false;
 299 }
 300
 301 static bool mount_is_bind(MountParameters *p) {
 302         assert(p);
 303
 304         if (mount_test_option(p->options, "bind"))
 305                 return true;
 306
 307         if (p->fstype && streq(p->fstype, "bind"))
 308                 return true;
 309
 310         return false;
 311 }
 312
 313 static bool needs_quota(MountParameters *p) {
 314         assert(p);
 315
 316         if (mount_is_network(p))
 317                 return false;
 318
 319         if (mount_is_bind(p))
 320                 return false;
 321
 322         return mount_test_option(p->options, "usrquota") ||
 323                 mount_test_option(p->options, "grpquota") ||
 324                 mount_test_option(p->options, "quota") ||
 325                 mount_test_option(p->options, "usrjquota") ||
 326                 mount_test_option(p->options, "grpjquota");
 327 }
 328
 329 static int mount_add_fstab_links(Mount *m) {
 330         const char *target, *after = NULL;
 331         MountParameters *p;
 332         Unit *tu;
 333         int r;
 334         bool noauto, nofail, handle, automount;
 335
 336         assert(m);
 337
 338         if (m->meta.manager->running_as != MANAGER_SYSTEM)
 339                 return 0;
 340
 341         if (!(p = get_mount_parameters_configured(m)))
 342                 return 0;
 343
 344         if (p != &m->parameters_etc_fstab)
 345                 return 0;
 346
 347         noauto = !!mount_test_option(p->options, "noauto");
 348         nofail = !!mount_test_option(p->options, "nofail");
 349         automount =
 350                 mount_test_option(p->options, "comment=systemd.automount") ||
 351                 mount_test_option(p->options, "x-systemd-automount");
 352         handle =
 353                 automount ||
 354                 mount_test_option(p->options, "comment=systemd.mount") ||
 355                 mount_test_option(p->options, "x-systemd-mount") ||
 356                 m->meta.manager->mount_auto;
 357
 358         if (mount_is_network(p)) {
 359                 target = SPECIAL_REMOTE_FS_TARGET;
 360                 after = SPECIAL_NETWORK_TARGET;
 361         } else
 362                 target = SPECIAL_LOCAL_FS_TARGET;
 363
 364         if (!path_equal(m->where, "/"))
 365                 if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
 366                         return r;
 367
 368         if ((r = manager_load_unit(m->meta.manager, target, NULL, NULL, &tu)) < 0)
 369                 return r;
 370
 371         if (after)
 372                 if ((r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, NULL, true)) < 0)
 373                         return r;
 374
 375         if (automount) {
 376                 Unit *am;
 377
 378                 if ((r = unit_load_related_unit(UNIT(m), ".automount", &am)) < 0)
 379                         return r;
 380
 381                 /* If auto is configured as well also pull in the
 382                  * mount right-away, but don't rely on it. */
 383                 if (!noauto) /* automount + auto */
 384                         if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(m), true)) < 0)
 385                                 return r;
 386
 387                 /* Install automount unit */
 388                 if (!nofail) /* automount + fail */
 389                         return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_REQUIRES, UNIT(am), true);
 390                 else /* automount + nofail */
 391                         return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_WANTS, UNIT(am), true);
 392
 393         } else if (handle && !noauto) {
 394
 395                 /* Automatically add mount points that aren't natively
 396                  * configured to local-fs.target */
 397
 398                 if (!nofail) /* auto + fail */
 399                         return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true);
 400                 else /* auto + nofail */
 401                         return unit_add_dependency(tu, UNIT_WANTS, UNIT(m), true);
 402         }
 403
 404         return 0;
 405 }
 406
 407 static int mount_add_device_links(Mount *m) {
 408         MountParameters *p;
 409         int r;
 410
 411         assert(m);
 412
 413         if (!(p = get_mount_parameters_configured(m)))
 414                 return 0;
 415
 416         if (!p->what)
 417                 return 0;
 418
 419         if (!mount_is_bind(p) &&
 420             !path_equal(m->where, "/") &&
 421             p == &m->parameters_etc_fstab) {
 422                 bool nofail, noauto;
 423
 424                 noauto = !!mount_test_option(p->options, "noauto");
 425                 nofail = !!mount_test_option(p->options, "nofail");
 426
 427                 if ((r = unit_add_node_link(UNIT(m), p->what,
 428                                             !noauto && nofail &&
 429                                             UNIT(m)->meta.manager->running_as == MANAGER_SYSTEM)) < 0)
 430                         return r;
 431         }
 432
 433         if (p->passno > 0 &&
 434             !mount_is_bind(p) &&
 435             UNIT(m)->meta.manager->running_as == MANAGER_SYSTEM &&
 436             !path_equal(m->where, "/")) {
 437                 char *name;
 438                 Unit *fsck;
 439                 /* Let's add in the fsck service */
 440
 441                 /* aka SPECIAL_FSCK_SERVICE */
 442                 if (!(name = unit_name_from_path_instance("fsck", p->what, ".service")))
 443                         return -ENOMEM;
 444
 445                 if ((r = manager_load_unit_prepare(m->meta.manager, name, NULL, NULL, &fsck)) < 0) {
 446                         log_warning("Failed to prepare unit %s: %s", name, strerror(-r));
 447                         free(name);
 448                         return r;
 449                 }
 450
 451                 free(name);
 452
 453                 SERVICE(fsck)->fsck_passno = p->passno;
 454
 455                 if ((r = unit_add_two_dependencies(UNIT(m), UNIT_AFTER, UNIT_REQUIRES, fsck, true)) < 0)
 456                         return r;
 457         }
 458
 459         return 0;
 460 }
 461
 462 static int mount_add_default_dependencies(Mount *m) {
 463         int r;
 464
 465         assert(m);
 466
 467         if (m->meta.manager->running_as == MANAGER_SYSTEM &&
 468             !path_equal(m->where, "/")) {
 469                 MountParameters *p;
 470
 471                 p = get_mount_parameters_configured(m);
 472
 473                 if (p && needs_quota(p)) {
 474                         if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTACHECK_SERVICE, NULL, true)) < 0 ||
 475                             (r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTAON_SERVICE, NULL, true)) < 0)
 476                                 return r;
 477                 }
 478
 479                 if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
 480                         return r;
 481         }
 482
 483         return 0;
 484 }
 485
 486 static int mount_fix_timeouts(Mount *m) {
 487         MountParameters *p;
 488         const char *timeout = NULL;
 489         Unit *other;
 490         Iterator i;
 491         usec_t u;
 492         char *t;
 493         int r;
 494
 495         assert(m);
 496
 497         if (!(p = get_mount_parameters_configured(m)))
 498                 return 0;
 499
 500         /* Allow configuration how long we wait for a device that
 501          * backs a mount point to show up. This is useful to support
 502          * endless device timeouts for devices that show up only after
 503          * user input, like crypto devices. */
 504
 505         if ((timeout = mount_test_option(p->options, "comment=systemd.device-timeout")))
 506                 timeout += 31;
 507         else if ((timeout = mount_test_option(p->options, "x-systemd-device-timeout")))
 508                 timeout += 25;
 509         else
 510                 return 0;
 511
 512         t = strndup(timeout, strcspn(timeout, ",;" WHITESPACE));
 513         if (!t)
 514                 return -ENOMEM;
 515
 516         r = parse_usec(t, &u);
 517         free(t);
 518
 519         if (r < 0) {
 520                 log_warning("Failed to parse timeout for %s, ignoring: %s", m->where, timeout);
 521                 return r;
 522         }
 523
 524         SET_FOREACH(other, m->meta.dependencies[UNIT_AFTER], i) {
 525                 if (other->meta.type != UNIT_DEVICE)
 526                         continue;
 527
 528                 other->meta.job_timeout = u;
 529         }
 530
 531         return 0;
 532 }
 533
 534 static int mount_verify(Mount *m) {
 535         bool b;
 536         char *e;
 537         assert(m);
 538
 539         if (m->meta.load_state != UNIT_LOADED)
 540                 return 0;
 541
 542         if (!m->from_etc_fstab && !m->from_fragment && !m->from_proc_self_mountinfo)
 543                 return -ENOENT;
 544
 545         if (!(e = unit_name_from_path(m->where, ".mount")))
 546                 return -ENOMEM;
 547
 548         b = unit_has_name(UNIT(m), e);
 549         free(e);
 550
 551         if (!b) {
 552                 log_error("%s's Where setting doesn't match unit name. Refusing.", m->meta.id);
 553                 return -EINVAL;
 554         }
 555
 556         if (mount_point_is_api(m->where) || mount_point_ignore(m->where)) {
 557                 log_error("Cannot create mount unit for API file system %s. Refusing.", m->where);
 558                 return -EINVAL;
 559         }
 560
 561         if (m->meta.fragment_path && !m->parameters_fragment.what) {
 562                 log_error("%s's What setting is missing. Refusing.", m->meta.id);
 563                 return -EBADMSG;
 564         }
 565
 566         if (m->exec_context.pam_name && m->exec_context.kill_mode != KILL_CONTROL_GROUP) {
 567                 log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", m->meta.id);
 568                 return -EINVAL;
 569         }
 570
 571         return 0;
 572 }
 573
 574 static int mount_load(Unit *u) {
 575         Mount *m = MOUNT(u);
 576         int r;
 577
 578         assert(u);
 579         assert(u->meta.load_state == UNIT_STUB);
 580
 581         if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
 582                 return r;
 583
 584         /* This is a new unit? Then let's add in some extras */
 585         if (u->meta.load_state == UNIT_LOADED) {
 586                 if ((r = unit_add_exec_dependencies(u, &m->exec_context)) < 0)
 587                         return r;
 588
 589                 if (m->meta.fragment_path)
 590                         m->from_fragment = true;
 591                 else if (m->from_etc_fstab)
 592                         m->meta.default_dependencies = false;
 593
 594                 if (!m->where)
 595                         if (!(m->where = unit_name_to_path(u->meta.id)))
 596                                 return -ENOMEM;
 597
 598                 path_kill_slashes(m->where);
 599
 600                 if (!m->meta.description)
 601                         if ((r = unit_set_description(u, m->where)) < 0)
 602                                 return r;
 603
 604                 if ((r = mount_add_device_links(m)) < 0)
 605                         return r;
 606
 607                 if ((r = mount_add_mount_links(m)) < 0)
 608                         return r;
 609
 610                 if ((r = mount_add_socket_links(m)) < 0)
 611                         return r;
 612
 613                 if ((r = mount_add_swap_links(m)) < 0)
 614                         return r;
 615
 616                 if ((r = mount_add_path_links(m)) < 0)
 617                         return r;
 618
 619                 if ((r = mount_add_automount_links(m)) < 0)
 620                         return r;
 621
 622                 if ((r = mount_add_fstab_links(m)) < 0)
 623                         return r;
 624
 625                 if (m->meta.default_dependencies)
 626                         if ((r = mount_add_default_dependencies(m)) < 0)
 627                                 return r;
 628
 629                 if ((r = unit_add_default_cgroups(u)) < 0)
 630                         return r;
 631
 632                 mount_fix_timeouts(m);
 633         }
 634
 635         return mount_verify(m);
 636 }
 637
 638 static int mount_notify_automount(Mount *m, int status) {
 639         Unit *p;
 640         int r;
 641
 642         assert(m);
 643
 644         if ((r = unit_get_related_unit(UNIT(m), ".automount", &p)) < 0)
 645                 return r == -ENOENT ? 0 : r;
 646
 647         return automount_send_ready(AUTOMOUNT(p), status);
 648 }
 649
 650 static void mount_set_state(Mount *m, MountState state) {
 651         MountState old_state;
 652         assert(m);
 653
 654         old_state = m->state;
 655         m->state = state;
 656
 657         if (state != MOUNT_MOUNTING &&
 658             state != MOUNT_MOUNTING_DONE &&
 659             state != MOUNT_REMOUNTING &&
 660             state != MOUNT_UNMOUNTING &&
 661             state != MOUNT_MOUNTING_SIGTERM &&
 662             state != MOUNT_MOUNTING_SIGKILL &&
 663             state != MOUNT_UNMOUNTING_SIGTERM &&
 664             state != MOUNT_UNMOUNTING_SIGKILL &&
 665             state != MOUNT_REMOUNTING_SIGTERM &&
 666             state != MOUNT_REMOUNTING_SIGKILL) {
 667                 unit_unwatch_timer(UNIT(m), &m->timer_watch);
 668                 mount_unwatch_control_pid(m);
 669                 m->control_command = NULL;
 670                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
 671         }
 672
 673         if (state == MOUNT_MOUNTED ||
 674             state == MOUNT_REMOUNTING)
 675                 mount_notify_automount(m, 0);
 676         else if (state == MOUNT_DEAD ||
 677                  state == MOUNT_UNMOUNTING ||
 678                  state == MOUNT_MOUNTING_SIGTERM ||
 679                  state == MOUNT_MOUNTING_SIGKILL ||
 680                  state == MOUNT_REMOUNTING_SIGTERM ||
 681                  state == MOUNT_REMOUNTING_SIGKILL ||
 682                  state == MOUNT_UNMOUNTING_SIGTERM ||
 683                  state == MOUNT_UNMOUNTING_SIGKILL ||
 684                  state == MOUNT_FAILED)
 685                 mount_notify_automount(m, -ENODEV);
 686
 687         if (state != old_state)
 688                 log_debug("%s changed %s -> %s",
 689                           m->meta.id,
 690                           mount_state_to_string(old_state),
 691                           mount_state_to_string(state));
 692
 693         unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state], !m->reload_failure);
 694         m->reload_failure = false;
 695 }
 696
 697 static int mount_coldplug(Unit *u) {
 698         Mount *m = MOUNT(u);
 699         MountState new_state = MOUNT_DEAD;
 700         int r;
 701
 702         assert(m);
 703         assert(m->state == MOUNT_DEAD);
 704
 705         if (m->deserialized_state != m->state)
 706                 new_state = m->deserialized_state;
 707         else if (m->from_proc_self_mountinfo)
 708                 new_state = MOUNT_MOUNTED;
 709
 710         if (new_state != m->state) {
 711
 712                 if (new_state == MOUNT_MOUNTING ||
 713                     new_state == MOUNT_MOUNTING_DONE ||
 714                     new_state == MOUNT_REMOUNTING ||
 715                     new_state == MOUNT_UNMOUNTING ||
 716                     new_state == MOUNT_MOUNTING_SIGTERM ||
 717                     new_state == MOUNT_MOUNTING_SIGKILL ||
 718                     new_state == MOUNT_UNMOUNTING_SIGTERM ||
 719                     new_state == MOUNT_UNMOUNTING_SIGKILL ||
 720                     new_state == MOUNT_REMOUNTING_SIGTERM ||
 721                     new_state == MOUNT_REMOUNTING_SIGKILL) {
 722
 723                         if (m->control_pid <= 0)
 724                                 return -EBADMSG;
 725
 726                         if ((r = unit_watch_pid(UNIT(m), m->control_pid)) < 0)
 727                                 return r;
 728
 729                         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 730                                 return r;
 731                 }
 732
 733                 mount_set_state(m, new_state);
 734         }
 735
 736         return 0;
 737 }
 738
 739 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
 740         Mount *m = MOUNT(u);
 741         MountParameters *p;
 742
 743         assert(m);
 744         assert(f);
 745
 746         p = get_mount_parameters(m);
 747
 748         fprintf(f,
 749                 "%sMount State: %s\n"
 750                 "%sWhere: %s\n"
 751                 "%sWhat: %s\n"
 752                 "%sFile System Type: %s\n"
 753                 "%sOptions: %s\n"
 754                 "%sFrom /etc/fstab: %s\n"
 755                 "%sFrom /proc/self/mountinfo: %s\n"
 756                 "%sFrom fragment: %s\n"
 757                 "%sDirectoryMode: %04o\n",
 758                 prefix, mount_state_to_string(m->state),
 759                 prefix, m->where,
 760                 prefix, strna(p->what),
 761                 prefix, strna(p->fstype),
 762                 prefix, strna(p->options),
 763                 prefix, yes_no(m->from_etc_fstab),
 764                 prefix, yes_no(m->from_proc_self_mountinfo),
 765                 prefix, yes_no(m->from_fragment),
 766                 prefix, m->directory_mode);
 767
 768         if (m->control_pid > 0)
 769                 fprintf(f,
 770                         "%sControl PID: %lu\n",
 771                         prefix, (unsigned long) m->control_pid);
 772
 773         exec_context_dump(&m->exec_context, f, prefix);
 774 }
 775
 776 static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
 777         pid_t pid;
 778         int r;
 779
 780         assert(m);
 781         assert(c);
 782         assert(_pid);
 783
 784         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 785                 goto fail;
 786
 787         if ((r = exec_spawn(c,
 788                             NULL,
 789                             &m->exec_context,
 790                             NULL, 0,
 791                             m->meta.manager->environment,
 792                             true,
 793                             true,
 794                             true,
 795                             m->meta.manager->confirm_spawn,
 796                             m->meta.cgroup_bondings,
 797                             m->meta.cgroup_attributes,
 798                             &pid)) < 0)
 799                 goto fail;
 800
 801         if ((r = unit_watch_pid(UNIT(m), pid)) < 0)
 802                 /* FIXME: we need to do something here */
 803                 goto fail;
 804
 805         *_pid = pid;
 806
 807         return 0;
 808
 809 fail:
 810         unit_unwatch_timer(UNIT(m), &m->timer_watch);
 811
 812         return r;
 813 }
 814
 815 static void mount_enter_dead(Mount *m, bool success) {
 816         assert(m);
 817
 818         if (!success)
 819                 m->failure = true;
 820
 821         mount_set_state(m, m->failure ? MOUNT_FAILED : MOUNT_DEAD);
 822 }
 823
 824 static void mount_enter_mounted(Mount *m, bool success) {
 825         assert(m);
 826
 827         if (!success)
 828                 m->failure = true;
 829
 830         mount_set_state(m, MOUNT_MOUNTED);
 831 }
 832
 833 static void mount_enter_signal(Mount *m, MountState state, bool success) {
 834         int r;
 835         Set *pid_set = NULL;
 836         bool wait_for_exit = false;
 837
 838         assert(m);
 839
 840         if (!success)
 841                 m->failure = true;
 842
 843         if (m->exec_context.kill_mode != KILL_NONE) {
 844                 int sig = (state == MOUNT_MOUNTING_SIGTERM ||
 845                            state == MOUNT_UNMOUNTING_SIGTERM ||
 846                            state == MOUNT_REMOUNTING_SIGTERM) ? m->exec_context.kill_signal : SIGKILL;
 847
 848                 if (m->control_pid > 0) {
 849                         if (kill_and_sigcont(m->control_pid, sig) < 0 && errno != ESRCH)
 850
 851                                 log_warning("Failed to kill control process %li: %m", (long) m->control_pid);
 852                         else
 853                                 wait_for_exit = true;
 854                 }
 855
 856                 if (m->exec_context.kill_mode == KILL_CONTROL_GROUP) {
 857
 858                         if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
 859                                 r = -ENOMEM;
 860                                 goto fail;
 861                         }
 862
 863                         /* Exclude the control pid from being killed via the cgroup */
 864                         if (m->control_pid > 0)
 865                                 if ((r = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0)
 866                                         goto fail;
 867
 868                         if ((r = cgroup_bonding_kill_list(m->meta.cgroup_bondings, sig, true, pid_set)) < 0) {
 869                                 if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
 870                                         log_warning("Failed to kill control group: %s", strerror(-r));
 871                         } else if (r > 0)
 872                                 wait_for_exit = true;
 873
 874                         set_free(pid_set);
 875                         pid_set = NULL;
 876                 }
 877         }
 878
 879         if (wait_for_exit) {
 880                 if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 881                         goto fail;
 882
 883                 mount_set_state(m, state);
 884         } else if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 885                 mount_enter_mounted(m, true);
 886         else
 887                 mount_enter_dead(m, true);
 888
 889         return;
 890
 891 fail:
 892         log_warning("%s failed to kill processes: %s", m->meta.id, strerror(-r));
 893
 894         if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 895                 mount_enter_mounted(m, false);
 896         else
 897                 mount_enter_dead(m, false);
 898
 899         if (pid_set)
 900                 set_free(pid_set);
 901 }
 902
 903 static void mount_enter_unmounting(Mount *m, bool success) {
 904         int r;
 905
 906         assert(m);
 907
 908         if (!success)
 909                 m->failure = true;
 910
 911         m->control_command_id = MOUNT_EXEC_UNMOUNT;
 912         m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
 913
 914         if ((r = exec_command_set(
 915                              m->control_command,
 916                              "/bin/umount",
 917                              m->where,
 918                              NULL)) < 0)
 919                 goto fail;
 920
 921         mount_unwatch_control_pid(m);
 922
 923         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 924                 goto fail;
 925
 926         mount_set_state(m, MOUNT_UNMOUNTING);
 927
 928         return;
 929
 930 fail:
 931         log_warning("%s failed to run 'umount' task: %s", m->meta.id, strerror(-r));
 932         mount_enter_mounted(m, false);
 933 }
 934
 935 static void mount_enter_mounting(Mount *m) {
 936         int r;
 937         MountParameters *p;
 938
 939         assert(m);
 940
 941         m->control_command_id = MOUNT_EXEC_MOUNT;
 942         m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
 943
 944         mkdir_p(m->where, m->directory_mode);
 945
 946         /* Create the source directory for bind-mounts if needed */
 947         p = get_mount_parameters_configured(m);
 948         if (p && mount_is_bind(p))
 949                 mkdir_p(p->what, m->directory_mode);
 950
 951         if (m->from_fragment)
 952                 r = exec_command_set(
 953                                 m->control_command,
 954                                 "/bin/mount",
 955                                 m->parameters_fragment.what,
 956                                 m->where,
 957                                 "-t", m->parameters_fragment.fstype ? m->parameters_fragment.fstype : "auto",
 958                                 m->parameters_fragment.options ? "-o" : NULL, m->parameters_fragment.options,
 959                                 NULL);
 960         else if (m->from_etc_fstab)
 961                 r = exec_command_set(
 962                                 m->control_command,
 963                                 "/bin/mount",
 964                                 m->where,
 965                                 NULL);
 966         else
 967                 r = -ENOENT;
 968
 969         if (r < 0)
 970                 goto fail;
 971
 972         mount_unwatch_control_pid(m);
 973
 974         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 975                 goto fail;
 976
 977         mount_set_state(m, MOUNT_MOUNTING);
 978
 979         return;
 980
 981 fail:
 982         log_warning("%s failed to run 'mount' task: %s", m->meta.id, strerror(-r));
 983         mount_enter_dead(m, false);
 984 }
 985
 986 static void mount_enter_mounting_done(Mount *m) {
 987         assert(m);
 988
 989         mount_set_state(m, MOUNT_MOUNTING_DONE);
 990 }
 991
 992 static void mount_enter_remounting(Mount *m, bool success) {
 993         int r;
 994
 995         assert(m);
 996
 997         if (!success)
 998                 m->failure = true;
 999
1000         m->control_command_id = MOUNT_EXEC_REMOUNT;
1001         m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
1002
1003         if (m->from_fragment) {
1004                 char *buf = NULL;
1005                 const char *o;
1006
1007                 if (m->parameters_fragment.options) {
1008                         if (!(buf = strappend("remount,", m->parameters_fragment.options))) {
1009                                 r = -ENOMEM;
1010                                 goto fail;
1011                         }
1012
1013                         o = buf;
1014                 } else
1015                         o = "remount";
1016
1017                 r = exec_command_set(
1018                                 m->control_command,
1019                                 "/bin/mount",
1020                                 m->parameters_fragment.what,
1021                                 m->where,
1022                                 "-t", m->parameters_fragment.fstype ? m->parameters_fragment.fstype : "auto",
1023                                 "-o", o,
1024                                 NULL);
1025
1026                 free(buf);
1027         } else if (m->from_etc_fstab)
1028                 r = exec_command_set(
1029                                 m->control_command,
1030                                 "/bin/mount",
1031                                 m->where,
1032                                 "-o", "remount",
1033                                 NULL);
1034         else
1035                 r = -ENOENT;
1036
1037         if (r < 0)
1038                 goto fail;
1039
1040         mount_unwatch_control_pid(m);
1041
1042         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
1043                 goto fail;
1044
1045         mount_set_state(m, MOUNT_REMOUNTING);
1046
1047         return;
1048
1049 fail:
1050         log_warning("%s failed to run 'remount' task: %s", m->meta.id, strerror(-r));
1051         m->reload_failure = true;
1052         mount_enter_mounted(m, true);
1053 }
1054
1055 static int mount_start(Unit *u) {
1056         Mount *m = MOUNT(u);
1057
1058         assert(m);
1059
1060         /* We cannot fulfill this request right now, try again later
1061          * please! */
1062         if (m->state == MOUNT_UNMOUNTING ||
1063             m->state == MOUNT_UNMOUNTING_SIGTERM ||
1064             m->state == MOUNT_UNMOUNTING_SIGKILL ||
1065             m->state == MOUNT_MOUNTING_SIGTERM ||
1066             m->state == MOUNT_MOUNTING_SIGKILL)
1067                 return -EAGAIN;
1068
1069         /* Already on it! */
1070         if (m->state == MOUNT_MOUNTING)
1071                 return 0;
1072
1073         assert(m->state == MOUNT_DEAD || m->state == MOUNT_FAILED);
1074
1075         m->failure = false;
1076         mount_enter_mounting(m);
1077         return 0;
1078 }
1079
1080 static int mount_stop(Unit *u) {
1081         Mount *m = MOUNT(u);
1082
1083         assert(m);
1084
1085         /* Already on it */
1086         if (m->state == MOUNT_UNMOUNTING ||
1087             m->state == MOUNT_UNMOUNTING_SIGKILL ||
1088             m->state == MOUNT_UNMOUNTING_SIGTERM ||
1089             m->state == MOUNT_MOUNTING_SIGTERM ||
1090             m->state == MOUNT_MOUNTING_SIGKILL)
1091                 return 0;
1092
1093         assert(m->state == MOUNT_MOUNTING ||
1094                m->state == MOUNT_MOUNTING_DONE ||
1095                m->state == MOUNT_MOUNTED ||
1096                m->state == MOUNT_REMOUNTING ||
1097                m->state == MOUNT_REMOUNTING_SIGTERM ||
1098                m->state == MOUNT_REMOUNTING_SIGKILL);
1099
1100         mount_enter_unmounting(m, true);
1101         return 0;
1102 }
1103
1104 static int mount_reload(Unit *u) {
1105         Mount *m = MOUNT(u);
1106
1107         assert(m);
1108
1109         if (m->state == MOUNT_MOUNTING_DONE)
1110                 return -EAGAIN;
1111
1112         assert(m->state == MOUNT_MOUNTED);
1113
1114         mount_enter_remounting(m, true);
1115         return 0;
1116 }
1117
1118 static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
1119         Mount *m = MOUNT(u);
1120
1121         assert(m);
1122         assert(f);
1123         assert(fds);
1124
1125         unit_serialize_item(u, f, "state", mount_state_to_string(m->state));
1126         unit_serialize_item(u, f, "failure", yes_no(m->failure));
1127
1128         if (m->control_pid > 0)
1129                 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) m->control_pid);
1130
1131         if (m->control_command_id >= 0)
1132                 unit_serialize_item(u, f, "control-command", mount_exec_command_to_string(m->control_command_id));
1133
1134         return 0;
1135 }
1136
1137 static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1138         Mount *m = MOUNT(u);
1139
1140         assert(u);
1141         assert(key);
1142         assert(value);
1143         assert(fds);
1144
1145         if (streq(key, "state")) {
1146                 MountState state;
1147
1148                 if ((state = mount_state_from_string(value)) < 0)
1149                         log_debug("Failed to parse state value %s", value);
1150                 else
1151                         m->deserialized_state = state;
1152         } else if (streq(key, "failure")) {
1153                 int b;
1154
1155                 if ((b = parse_boolean(value)) < 0)
1156                         log_debug("Failed to parse failure value %s", value);
1157                 else
1158                         m->failure = b || m->failure;
1159
1160         } else if (streq(key, "control-pid")) {
1161                 pid_t pid;
1162
1163                 if (parse_pid(value, &pid) < 0)
1164                         log_debug("Failed to parse control-pid value %s", value);
1165                 else
1166                         m->control_pid = pid;
1167         } else if (streq(key, "control-command")) {
1168                 MountExecCommand id;
1169
1170                 if ((id = mount_exec_command_from_string(value)) < 0)
1171                         log_debug("Failed to parse exec-command value %s", value);
1172                 else {
1173                         m->control_command_id = id;
1174                         m->control_command = m->exec_command + id;
1175                 }
1176
1177         } else
1178                 log_debug("Unknown serialization key '%s'", key);
1179
1180         return 0;
1181 }
1182
1183 static UnitActiveState mount_active_state(Unit *u) {
1184         assert(u);
1185
1186         return state_translation_table[MOUNT(u)->state];
1187 }
1188
1189 static const char *mount_sub_state_to_string(Unit *u) {
1190         assert(u);
1191
1192         return mount_state_to_string(MOUNT(u)->state);
1193 }
1194
1195 static bool mount_check_gc(Unit *u) {
1196         Mount *m = MOUNT(u);
1197
1198         assert(m);
1199
1200         return m->from_etc_fstab || m->from_proc_self_mountinfo;
1201 }
1202
1203 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1204         Mount *m = MOUNT(u);
1205         bool success;
1206
1207         assert(m);
1208         assert(pid >= 0);
1209
1210         if (pid != m->control_pid)
1211                 return;
1212
1213         m->control_pid = 0;
1214
1215         success = is_clean_exit(code, status);
1216         m->failure = m->failure || !success;
1217
1218         if (m->control_command) {
1219                 exec_status_exit(&m->control_command->exec_status, &m->exec_context, pid, code, status);
1220                 m->control_command = NULL;
1221                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
1222         }
1223
1224         log_full(success ? LOG_DEBUG : LOG_NOTICE,
1225                  "%s mount process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
1226
1227         /* Note that mount(8) returning and the kernel sending us a
1228          * mount table change event might happen out-of-order. If an
1229          * operation succeed we assume the kernel will follow soon too
1230          * and already change into the resulting state.  If it fails
1231          * we check if the kernel still knows about the mount. and
1232          * change state accordingly. */
1233
1234         switch (m->state) {
1235
1236         case MOUNT_MOUNTING:
1237         case MOUNT_MOUNTING_DONE:
1238         case MOUNT_MOUNTING_SIGKILL:
1239         case MOUNT_MOUNTING_SIGTERM:
1240
1241                 if (success)
1242                         mount_enter_mounted(m, true);
1243                 else if (m->from_proc_self_mountinfo)
1244                         mount_enter_mounted(m, false);
1245                 else
1246                         mount_enter_dead(m, false);
1247                 break;
1248
1249         case MOUNT_REMOUNTING:
1250         case MOUNT_REMOUNTING_SIGKILL:
1251         case MOUNT_REMOUNTING_SIGTERM:
1252
1253                 m->reload_failure = !success;
1254                 if (m->from_proc_self_mountinfo)
1255                         mount_enter_mounted(m, true);
1256                 else
1257                         mount_enter_dead(m, true);
1258
1259                 break;
1260
1261         case MOUNT_UNMOUNTING:
1262         case MOUNT_UNMOUNTING_SIGKILL:
1263         case MOUNT_UNMOUNTING_SIGTERM:
1264
1265                 if (success)
1266                         mount_enter_dead(m, true);
1267                 else if (m->from_proc_self_mountinfo)
1268                         mount_enter_mounted(m, false);
1269                 else
1270                         mount_enter_dead(m, false);
1271                 break;
1272
1273         default:
1274                 assert_not_reached("Uh, control process died at wrong time.");
1275         }
1276
1277         /* Notify clients about changed exit status */
1278         unit_add_to_dbus_queue(u);
1279 }
1280
1281 static void mount_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
1282         Mount *m = MOUNT(u);
1283
1284         assert(m);
1285         assert(elapsed == 1);
1286         assert(w == &m->timer_watch);
1287
1288         switch (m->state) {
1289
1290         case MOUNT_MOUNTING:
1291         case MOUNT_MOUNTING_DONE:
1292                 log_warning("%s mounting timed out. Stopping.", u->meta.id);
1293                 mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, false);
1294                 break;
1295
1296         case MOUNT_REMOUNTING:
1297                 log_warning("%s remounting timed out. Stopping.", u->meta.id);
1298                 m->reload_failure = true;
1299                 mount_enter_mounted(m, true);
1300                 break;
1301
1302         case MOUNT_UNMOUNTING:
1303                 log_warning("%s unmounting timed out. Stopping.", u->meta.id);
1304                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, false);
1305                 break;
1306
1307         case MOUNT_MOUNTING_SIGTERM:
1308                 if (m->exec_context.send_sigkill) {
1309                         log_warning("%s mounting timed out. Killing.", u->meta.id);
1310                         mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, false);
1311                 } else {
1312                         log_warning("%s mounting timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
1313
1314                         if (m->from_proc_self_mountinfo)
1315                                 mount_enter_mounted(m, false);
1316                         else
1317                                 mount_enter_dead(m, false);
1318                 }
1319                 break;
1320
1321         case MOUNT_REMOUNTING_SIGTERM:
1322                 if (m->exec_context.send_sigkill) {
1323                         log_warning("%s remounting timed out. Killing.", u->meta.id);
1324                         mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, false);
1325                 } else {
1326                         log_warning("%s remounting timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
1327
1328                         if (m->from_proc_self_mountinfo)
1329                                 mount_enter_mounted(m, false);
1330                         else
1331                                 mount_enter_dead(m, false);
1332                 }
1333                 break;
1334
1335         case MOUNT_UNMOUNTING_SIGTERM:
1336                 if (m->exec_context.send_sigkill) {
1337                         log_warning("%s unmounting timed out. Killing.", u->meta.id);
1338                         mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, false);
1339                 } else {
1340                         log_warning("%s unmounting timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
1341
1342                         if (m->from_proc_self_mountinfo)
1343                                 mount_enter_mounted(m, false);
1344                         else
1345                                 mount_enter_dead(m, false);
1346                 }
1347                 break;
1348
1349         case MOUNT_MOUNTING_SIGKILL:
1350         case MOUNT_REMOUNTING_SIGKILL:
1351         case MOUNT_UNMOUNTING_SIGKILL:
1352                 log_warning("%s mount process still around after SIGKILL. Ignoring.", u->meta.id);
1353
1354                 if (m->from_proc_self_mountinfo)
1355                         mount_enter_mounted(m, false);
1356                 else
1357                         mount_enter_dead(m, false);
1358                 break;
1359
1360         default:
1361                 assert_not_reached("Timeout at wrong time.");
1362         }
1363 }
1364
1365 static int mount_add_one(
1366                 Manager *m,
1367                 const char *what,
1368                 const char *where,
1369                 const char *options,
1370                 const char *fstype,
1371                 int passno,
1372                 bool from_proc_self_mountinfo,
1373                 bool set_flags) {
1374         int r;
1375         Unit *u;
1376         bool delete;
1377         char *e, *w = NULL, *o = NULL, *f = NULL;
1378         MountParameters *p;
1379
1380         assert(m);
1381         assert(what);
1382         assert(where);
1383         assert(options);
1384         assert(fstype);
1385
1386         assert(!set_flags || from_proc_self_mountinfo);
1387
1388         /* Ignore API mount points. They should never be referenced in
1389          * dependencies ever. */
1390         if (mount_point_is_api(where) || mount_point_ignore(where))
1391                 return 0;
1392
1393         if (streq(fstype, "autofs"))
1394                 return 0;
1395
1396         /* probably some kind of swap, ignore */
1397         if (!is_path(where))
1398                 return 0;
1399
1400         if (!(e = unit_name_from_path(where, ".mount")))
1401                 return -ENOMEM;
1402
1403         if (!(u = manager_get_unit(m, e))) {
1404                 delete = true;
1405
1406                 if (!(u = unit_new(m))) {
1407                         free(e);
1408                         return -ENOMEM;
1409                 }
1410
1411                 r = unit_add_name(u, e);
1412                 free(e);
1413
1414                 if (r < 0)
1415                         goto fail;
1416
1417                 if (!(MOUNT(u)->where = strdup(where))) {
1418                         r = -ENOMEM;
1419                         goto fail;
1420                 }
1421
1422                 unit_add_to_load_queue(u);
1423         } else {
1424                 delete = false;
1425                 free(e);
1426         }
1427
1428         if (!(w = strdup(what)) ||
1429             !(o = strdup(options)) ||
1430             !(f = strdup(fstype))) {
1431                 r = -ENOMEM;
1432                 goto fail;
1433         }
1434
1435         if (from_proc_self_mountinfo) {
1436                 p = &MOUNT(u)->parameters_proc_self_mountinfo;
1437
1438                 if (set_flags) {
1439                         MOUNT(u)->is_mounted = true;
1440                         MOUNT(u)->just_mounted = !MOUNT(u)->from_proc_self_mountinfo;
1441                         MOUNT(u)->just_changed = !streq_ptr(p->options, o);
1442                 }
1443
1444                 MOUNT(u)->from_proc_self_mountinfo = true;
1445         } else {
1446                 p = &MOUNT(u)->parameters_etc_fstab;
1447                 MOUNT(u)->from_etc_fstab = true;
1448         }
1449
1450         free(p->what);
1451         p->what = w;
1452
1453         free(p->options);
1454         p->options = o;
1455
1456         free(p->fstype);
1457         p->fstype = f;
1458
1459         p->passno = passno;
1460
1461         unit_add_to_dbus_queue(u);
1462
1463         return 0;
1464
1465 fail:
1466         free(w);
1467         free(o);
1468         free(f);
1469
1470         if (delete && u)
1471                 unit_free(u);
1472
1473         return r;
1474 }
1475
1476 static int mount_find_pri(char *options) {
1477         char *end, *pri;
1478         unsigned long r;
1479
1480         if (!(pri = mount_test_option(options, "pri")))
1481                 return 0;
1482
1483         pri += 4;
1484
1485         errno = 0;
1486         r = strtoul(pri, &end, 10);
1487
1488         if (errno != 0)
1489                 return -errno;
1490
1491         if (end == pri || (*end != ',' && *end != 0))
1492                 return -EINVAL;
1493
1494         return (int) r;
1495 }
1496
1497 static int mount_load_etc_fstab(Manager *m) {
1498         FILE *f;
1499         int r = 0;
1500         struct mntent* me;
1501
1502         assert(m);
1503
1504         errno = 0;
1505         if (!(f = setmntent("/etc/fstab", "r")))
1506                 return -errno;
1507
1508         while ((me = getmntent(f))) {
1509                 char *where, *what;
1510                 int k;
1511
1512                 if (!(what = fstab_node_to_udev_node(me->mnt_fsname))) {
1513                         r = -ENOMEM;
1514                         goto finish;
1515                 }
1516
1517                 if (!(where = strdup(me->mnt_dir))) {
1518                         free(what);
1519                         r = -ENOMEM;
1520                         goto finish;
1521                 }
1522
1523                 if (what[0] == '/')
1524                         path_kill_slashes(what);
1525
1526                 if (where[0] == '/')
1527                         path_kill_slashes(where);
1528
1529                 if (streq(me->mnt_type, "swap")) {
1530                         int pri;
1531
1532                         if ((pri = mount_find_pri(me->mnt_opts)) < 0)
1533                                 k = pri;
1534                         else
1535                                 k = swap_add_one(m,
1536                                                  what,
1537                                                  NULL,
1538                                                  pri,
1539                                                  !!mount_test_option(me->mnt_opts, "noauto"),
1540                                                  !!mount_test_option(me->mnt_opts, "nofail"),
1541                                                  !!mount_test_option(me->mnt_opts, "comment=systemd.swapon"),
1542                                                  false);
1543                 } else
1544                         k = mount_add_one(m, what, where, me->mnt_opts, me->mnt_type, me->mnt_passno, false, false);
1545
1546                 free(what);
1547                 free(where);
1548
1549                 if (r < 0)
1550                         r = k;
1551         }
1552
1553 finish:
1554
1555         endmntent(f);
1556         return r;
1557 }
1558
1559 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1560         int r = 0;
1561         unsigned i;
1562         char *device, *path, *options, *options2, *fstype, *d, *p, *o;
1563
1564         assert(m);
1565
1566         rewind(m->proc_self_mountinfo);
1567
1568         for (i = 1;; i++) {
1569                 int k;
1570
1571                 device = path = options = options2 = fstype = d = p = o = NULL;
1572
1573                 if ((k = fscanf(m->proc_self_mountinfo,
1574                                 "%*s "       /* (1) mount id */
1575                                 "%*s "       /* (2) parent id */
1576                                 "%*s "       /* (3) major:minor */
1577                                 "%*s "       /* (4) root */
1578                                 "%ms "       /* (5) mount point */
1579                                 "%ms"        /* (6) mount options */
1580                                 "%*[^-]"     /* (7) optional fields */
1581                                 "- "         /* (8) separator */
1582                                 "%ms "       /* (9) file system type */
1583                                 "%ms"        /* (10) mount source */
1584                                 "%ms"        /* (11) mount options 2 */
1585                                 "%*[^\n]",   /* some rubbish at the end */
1586                                 &path,
1587                                 &options,
1588                                 &fstype,
1589                                 &device,
1590                                 &options2)) != 5) {
1591
1592                         if (k == EOF)
1593                                 break;
1594
1595                         log_warning("Failed to parse /proc/self/mountinfo:%u.", i);
1596                         goto clean_up;
1597                 }
1598
1599                 if (asprintf(&o, "%s,%s", options, options2) < 0) {
1600                         r = -ENOMEM;
1601                         goto finish;
1602                 }
1603
1604                 if (!(d = cunescape(device)) ||
1605                     !(p = cunescape(path))) {
1606                         r = -ENOMEM;
1607                         goto finish;
1608                 }
1609
1610                 if ((k = mount_add_one(m, d, p, o, fstype, 0, true, set_flags)) < 0)
1611                         r = k;
1612
1613 clean_up:
1614                 free(device);
1615                 free(path);
1616                 free(options);
1617                 free(options2);
1618                 free(fstype);
1619                 free(d);
1620                 free(p);
1621                 free(o);
1622         }
1623
1624 finish:
1625         free(device);
1626         free(path);
1627         free(options);
1628         free(options2);
1629         free(fstype);
1630         free(d);
1631         free(p);
1632         free(o);
1633
1634         return r;
1635 }
1636
1637 static void mount_shutdown(Manager *m) {
1638         assert(m);
1639
1640         if (m->proc_self_mountinfo) {
1641                 fclose(m->proc_self_mountinfo);
1642                 m->proc_self_mountinfo = NULL;
1643         }
1644 }
1645
1646 static int mount_enumerate(Manager *m) {
1647         int r;
1648         struct epoll_event ev;
1649         assert(m);
1650
1651         if (!m->proc_self_mountinfo) {
1652                 if (!(m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "re")))
1653                         return -errno;
1654
1655                 m->mount_watch.type = WATCH_MOUNT;
1656                 m->mount_watch.fd = fileno(m->proc_self_mountinfo);
1657
1658                 zero(ev);
1659                 ev.events = EPOLLPRI;
1660                 ev.data.ptr = &m->mount_watch;
1661
1662                 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->mount_watch.fd, &ev) < 0)
1663                         return -errno;
1664         }
1665
1666         if ((r = mount_load_etc_fstab(m)) < 0)
1667                 goto fail;
1668
1669         if ((r = mount_load_proc_self_mountinfo(m, false)) < 0)
1670                 goto fail;
1671
1672         return 0;
1673
1674 fail:
1675         mount_shutdown(m);
1676         return r;
1677 }
1678
1679 void mount_fd_event(Manager *m, int events) {
1680         Meta *meta;
1681         int r;
1682
1683         assert(m);
1684         assert(events & EPOLLPRI);
1685
1686         /* The manager calls this for every fd event happening on the
1687          * /proc/self/mountinfo file, which informs us about mounting
1688          * table changes */
1689
1690         if ((r = mount_load_proc_self_mountinfo(m, true)) < 0) {
1691                 log_error("Failed to reread /proc/self/mountinfo: %s", strerror(-r));
1692
1693                 /* Reset flags, just in case, for later calls */
1694                 LIST_FOREACH(units_by_type, meta, m->units_by_type[UNIT_MOUNT]) {
1695                         Mount *mount = (Mount*) meta;
1696
1697                         mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1698                 }
1699
1700                 return;
1701         }
1702
1703         manager_dispatch_load_queue(m);
1704
1705         LIST_FOREACH(units_by_type, meta, m->units_by_type[UNIT_MOUNT]) {
1706                 Mount *mount = (Mount*) meta;
1707
1708                 if (!mount->is_mounted) {
1709                         /* This has just been unmounted. */
1710
1711                         mount->from_proc_self_mountinfo = false;
1712
1713                         switch (mount->state) {
1714
1715                         case MOUNT_MOUNTED:
1716                                 mount_enter_dead(mount, true);
1717                                 break;
1718
1719                         default:
1720                                 mount_set_state(mount, mount->state);
1721                                 break;
1722
1723                         }
1724
1725                 } else if (mount->just_mounted || mount->just_changed) {
1726
1727                         /* New or changed mount entry */
1728
1729                         switch (mount->state) {
1730
1731                         case MOUNT_DEAD:
1732                         case MOUNT_FAILED:
1733                                 mount_enter_mounted(mount, true);
1734                                 break;
1735
1736                         case MOUNT_MOUNTING:
1737                                 mount_enter_mounting_done(mount);
1738                                 break;
1739
1740                         default:
1741                                 /* Nothing really changed, but let's
1742                                  * issue an notification call
1743                                  * nonetheless, in case somebody is
1744                                  * waiting for this. (e.g. file system
1745                                  * ro/rw remounts.) */
1746                                 mount_set_state(mount, mount->state);
1747                                 break;
1748                         }
1749                 }
1750
1751                 /* Reset the flags for later calls */
1752                 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1753         }
1754 }
1755
1756 static void mount_reset_failed(Unit *u) {
1757         Mount *m = MOUNT(u);
1758
1759         assert(m);
1760
1761         if (m->state == MOUNT_FAILED)
1762                 mount_set_state(m, MOUNT_DEAD);
1763
1764         m->failure = false;
1765 }
1766
1767 static int mount_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) {
1768         Mount *m = MOUNT(u);
1769         int r = 0;
1770         Set *pid_set = NULL;
1771
1772         assert(m);
1773
1774         if (who == KILL_MAIN) {
1775                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Mount units have no main processes");
1776                 return -ESRCH;
1777         }
1778
1779         if (m->control_pid <= 0 && who == KILL_CONTROL) {
1780                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill");
1781                 return -ESRCH;
1782         }
1783
1784         if (who == KILL_CONTROL || who == KILL_ALL)
1785                 if (m->control_pid > 0)
1786                         if (kill(m->control_pid, signo) < 0)
1787                                 r = -errno;
1788
1789         if (who == KILL_ALL && mode == KILL_CONTROL_GROUP) {
1790                 int q;
1791
1792                 if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func)))
1793                         return -ENOMEM;
1794
1795                 /* Exclude the control pid from being killed via the cgroup */
1796                 if (m->control_pid > 0)
1797                         if ((q = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0) {
1798                                 r = q;
1799                                 goto finish;
1800                         }
1801
1802                 if ((q = cgroup_bonding_kill_list(m->meta.cgroup_bondings, signo, false, pid_set)) < 0)
1803                         if (q != -EAGAIN && q != -ESRCH && q != -ENOENT)
1804                                 r = q;
1805         }
1806
1807 finish:
1808         if (pid_set)
1809                 set_free(pid_set);
1810
1811         return r;
1812 }
1813
1814 static const char* const mount_state_table[_MOUNT_STATE_MAX] = {
1815         [MOUNT_DEAD] = "dead",
1816         [MOUNT_MOUNTING] = "mounting",
1817         [MOUNT_MOUNTING_DONE] = "mounting-done",
1818         [MOUNT_MOUNTED] = "mounted",
1819         [MOUNT_REMOUNTING] = "remounting",
1820         [MOUNT_UNMOUNTING] = "unmounting",
1821         [MOUNT_MOUNTING_SIGTERM] = "mounting-sigterm",
1822         [MOUNT_MOUNTING_SIGKILL] = "mounting-sigkill",
1823         [MOUNT_REMOUNTING_SIGTERM] = "remounting-sigterm",
1824         [MOUNT_REMOUNTING_SIGKILL] = "remounting-sigkill",
1825         [MOUNT_UNMOUNTING_SIGTERM] = "unmounting-sigterm",
1826         [MOUNT_UNMOUNTING_SIGKILL] = "unmounting-sigkill",
1827         [MOUNT_FAILED] = "failed"
1828 };
1829
1830 DEFINE_STRING_TABLE_LOOKUP(mount_state, MountState);
1831
1832 static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = {
1833         [MOUNT_EXEC_MOUNT] = "ExecMount",
1834         [MOUNT_EXEC_UNMOUNT] = "ExecUnmount",
1835         [MOUNT_EXEC_REMOUNT] = "ExecRemount",
1836 };
1837
1838 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand);
1839
1840 const UnitVTable mount_vtable = {
1841         .suffix = ".mount",
1842         .sections =
1843                 "Unit\0"
1844                 "Mount\0"
1845                 "Install\0",
1846
1847         .no_alias = true,
1848         .no_instances = true,
1849         .show_status = true,
1850
1851         .init = mount_init,
1852         .load = mount_load,
1853         .done = mount_done,
1854
1855         .coldplug = mount_coldplug,
1856
1857         .dump = mount_dump,
1858
1859         .start = mount_start,
1860         .stop = mount_stop,
1861         .reload = mount_reload,
1862
1863         .kill = mount_kill,
1864
1865         .serialize = mount_serialize,
1866         .deserialize_item = mount_deserialize_item,
1867
1868         .active_state = mount_active_state,
1869         .sub_state_to_string = mount_sub_state_to_string,
1870
1871         .check_gc = mount_check_gc,
1872
1873         .sigchld_event = mount_sigchld_event,
1874         .timer_event = mount_timer_event,
1875
1876         .reset_failed = mount_reset_failed,
1877
1878         .bus_interface = "org.freedesktop.systemd1.Mount",
1879         .bus_message_handler = bus_mount_message_handler,
1880         .bus_invalidating_properties =  bus_mount_invalidating_properties,
1881
1882         .enumerate = mount_enumerate,
1883         .shutdown = mount_shutdown
1884 };